[StaticWebAssets] Add benchmarking infrastructure

[javiercn]

• Adds a benchmark project so that we can start adding benchmarks for some of the tasks

[dotnet-policy-service]

Thanks for your PR, @@javiercn.
To learn about the PR process and branching schedule of this repo, please take a look at the SDK PR Guide.

[Copilot]

Pull Request Overview

This PR introduces benchmarking infrastructure for the StaticWebAssets SDK by adding a new benchmark project and wiring it into the solution and package management.

• Adds a console entry point and empty benchmark using BenchmarkDotNet
• Sets up a dedicated benchmarks project with templates and ignores
• Updates solution files and central package versions to include BenchmarkDotNet

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/StaticWebAssetsSdk/benchmarks/Program.cs	Entry point to run all benchmarks
src/StaticWebAssetsSdk/benchmarks/Microsoft.NET.Sdk.StaticWebAssets.Benchmarks.csproj	Benchmark project setup
src/StaticWebAssetsSdk/benchmarks/EmptyBenchmark.cs	Initial no-op benchmark
src/StaticWebAssetsSdk/benchmarks/Directory.Build.template	Empty build template copied to props/targets
src/StaticWebAssetsSdk/benchmarks/.gitignore	Ignore BenchmarkDotNet artifacts
src/RazorSdk/Razor.slnf	Included benchmark project in solution filter
sdk.slnx	Added benchmarks folder to solution structure
eng/Versions.props	Defined BenchmarkDotNet package version
Directory.Packages.props	Centralized BenchmarkDotNet package version

Comments suppressed due to low confidence (1)

src/StaticWebAssetsSdk/benchmarks/Microsoft.NET.Sdk.StaticWebAssets.Benchmarks.csproj:4

• Verify that the TargetFramework 'net10.0' is supported by our build environment. If not, consider targeting a stable TFM like net7.0 or net8.0 to ensure compatibility.

    <TargetFramework>net10.0</TargetFramework>